Hmmm...CustServ (that is, Tony) decided to bail on me:
"What about meelee bursts by a fighter, or rogue exploits that are ranged bursts? Do they also extend to hit flying creatures indefinitely high (the idea being they are considered to be in that space), like you have ruled spells do?"
[sblock=]Greetings,
Complex rule interactions should always be, quite frankly, adjudicated by your Dungeon Master. However there are a few sources beyond the rule books that you and your Dungeon Master can use to determine the most usable and fun solution for your game.
You may want to start by checking out our FAQ and errata documents online at our website.
http://www.wizards.com/default.asp?x=dnd/rules
Many players and Dungeon Masters also read and ask questions on our message boards and chat rooms to discover what other Dungeon Masters have done in similar situations.
http://boards1.wizards.com/community_home.php
Your Dungeon Master is ultimately responsible for deciding how he/she wants to handle any such issue however, and with all the tools currently available it should be relatively easy to adjudicate this matter fairly, as well as in the spirit of making the game as fun as it can be.[/sblock]